A NOVEL MECHANICAL MODEL FOR MAGNETIC RESONANCE ELASTOGRAPHY
Journal Title: ROMANIAN JOURNAL OF TECHNICAL SCIENCES - APPLIED MECHANICS - Year 2010, Vol 55, Issue 1
Abstract
Magnetic resonance elastography is a non-invasive, in vivo imaging technique used to measure the elasticity of soft tissues subject to mechanical stresses. The resulting strains are measured using MR imaging and the elastic modulus is computed from viscoelastic models of tissue mechanics. In this paper we propose a novel model, called the fractional model of continuum mechanics, which is a generalization of the classical continuum mechanics theory in which the classic integer order spatial derivatives are replaced by fractional order spatial derivatives. The fractional model is a non-local, multi-scale model that can be used to solve both direct and inverse problems of importance in practical applications. In particular, our results to the inverse problem of elastography will show that the proposed model is capable to find the correct elastic moduli without having to perform any of the image processing steps required by the use of the classical continuum mechanics theory.
Authors and Affiliations
Corina DRAPACA
Keywords
Related Articles
- EP ID EP129259
- DOI -
- Views 63
- Downloads 0
EXPERIMENTAL AND NUMERICAL ASPECTS REGARDING LEAD ALLOY PLASTIC DEFORMATION
The aim of this paper is to present an experimental and finite element analysis (FEA) of the cold forward extrusion of lead alloy. The influence of die angle, reduction ratio and ram speed on the extrusion force during t...
SIMULTANEOUS POSITION AND STIFFNESS DISTRIBUTION CONTROL OF ELASTIC REDUNDANT CLOSED-LOOP MECHANISM
The present paper discusses a new design of robotic manipulator having redundant closed-loop mechanism with elastic passive joints. The proposed design is aiming to be utilized for developing robots that are capable to w...
SUR LA DEFORMATION D'UN TUBE CYLINDRIQUE
Une proposition de loi non-linéaire régissant le comportement des matériaux élastiques isotropes consiste souvent à généraliser la loi linéaire de Hooke, valable en petites déformations, par l’adjonction de termes supplé...
EXPERIMENTAL AND THEORETICAL ANALYSIS OF NOVEL TELESCOPIC DEVICES FOR EARTHQUAKE PROTECTION
The telescopic SERB devices are compact mechanical devices designed for bracing isolation systems. These devices can provide important dissipation of the seismic energy and can generate the necessary force to prevent the...
USE OF GENETIC ALGORITHMS FOR FITTING THE BOUC-WEN MODEL TO EXPERIMENTAL HYSTERETIC CURVES
In this paper a Genetic Algorithms (GA) method is developed to identify the Bouc-Wen model parameters from the experimental data of periodic loading tests. It is considered an extension of classical model in order to inc...